GPS 155XL/GNC 300XL Installation Manual
P/N 190-00067-22 Rev E Page 2-2
2.2.5
VHF Comm Interference of GPS
On many panel-mounted aircraft installations, VHF Communication radios can radiate strong harmonics from the
comm transceivers and their antenna. The GNC 300XL COMM section will not interfere with its GPS section.
However, placement of the GNC 300XL GPS antenna relative to a COMM and COMM antenna, including its own, is
critical.
Figure 2-1. GPS Antenna Installation Considerations
Use the following guidelines, in addition to others in this document, when locating the GPS 155XL/GNC 300XL and
its antenna(s).
•
GPS Antenna—Locate as far as possible from all COMM antennas and all COMMs (including the GNC
300XL). The GPS antenna will be much less sensitive to COMM antennas that use a 1.57542 GHz notch
filter.
•
GPS 155XL/GNC 300XL—Locate as far as possible from all COMM antennas.
